A kind of synthetic method of guanine-based pearlescent pigment

A pearlescent pigment, guanine-based technology, applied in the field of synthesis of guanine-based pearlescent pigments, can solve the problems of poor heat resistance and light resistance, limited natural nacre resources of guanine crystal micro-sheets, complicated preparation process, etc., and achieve good stability Effect

Active Publication Date: 2021-05-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As early as 1853, the French businessman Japoune extracted guanine crystals from freshwater fish scales and injected them into hollow glass spheres to prepare the so-called "modeled pearls". No report (Yuya Oaki, Soichiro Kaneko, Hiroaki Imai, J.Mater.Chem., 2012, 22, 22686. Dvir Gur, Maria Pierantoni, Neta Elool Dov, Anna Hirsh, Yishay Feldman, Steve Weiner, LiaAddadi, Cryst.Growth Des.2016, 16, 4975.)
[0004] Therefore, artificially synthesized guanine crystal microsheets with specific exposed surfaces are expected to solve the problems of limited natural nacre resources, complicated preparation process, high price, and poor heat and light resistance, and have important application value.

Method used

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  • A kind of synthetic method of guanine-based pearlescent pigment
  • A kind of synthetic method of guanine-based pearlescent pigment
  • A kind of synthetic method of guanine-based pearlescent pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 10ml formamide, add 10mg P(VP-co-VA), add 10mg uric acid, add 1.5ml water, add 0.5ml 0.1M guanine dissolved in 0.4M sodium hydroxide solution, react at 40°C for 1h. The system was expanded up to 20 times in the laboratory without significant change.

[0034] figure 1 It is an optical photograph of anhydrous guanine β-phase microsheets in this example, showing strong structural color. figure 2 It is the SEM photo of anhydrous guanine β phase microsheet in the present embodiment; image 3 It is the XRD of the anhydrous guanine β-phase microsheets in this example, which shows a strong preferred orientation.

Embodiment 2

[0036] 10ml formamide, add 10mg P(VP-co-VA), add 50mg guanosine, add 1.5ml water, add 0.5ml 0.1M guanine dissolved in 0.4M sodium hydroxide solution, react at 40°C for 1h. The system was expanded up to 20 times in the laboratory without significant change.

[0037] Figure 4 It is an optical photograph of anhydrous guanine α-phase microsheets in this example, showing strong structural color. Figure 5 It is the XRD of the anhydrous guanine α-phase microsheets in this example, which shows a strong preferred orientation.

Embodiment 3

[0039] To 10ml formamide, add 1mg P(VP-co-VA), add 10mg xanthine, add 0.25ml of 0.1M guanine dissolved in 0.4M potassium hydroxide solution, and react overnight at room temperature. The product in this example is anhydrous guanine β-phase micro twins.

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Abstract

The invention relates to a method for synthesizing guanine-based pearlescent pigments. The method comprises the following steps: 1) using guanine and sodium hydroxide or potassium hydroxide to configure a sodium or potassium salt solution of guanine; 2) configuring formamide, a small molecular additive and a polymer additive into a dispersion; 3 ) adding the sodium salt or potassium salt solution of guanine into the dispersion liquid, and after mixing, let it stand for a certain period of time to react to obtain a dispersion liquid of guanine micro-tablets, and then obtain guanine micro-tablets. By adopting the method of the present invention, guanine crystal microsheets with a specific exposed surface can be artificially synthesized, which have a size comparable to that of biological extraction samples, have good water or other solvent dispersibility, and the dispersion liquid has obvious pearlescent color.

Description

technical field [0001] The invention relates to the field of pearlescent pigments and new functional materials, in particular to a synthesis method of guanine-based pearlescent pigments. Background technique [0002] Pearlescent pigment is a characteristic pigment with soft pearly luster and can produce unique visual effects. It is widely used in coatings, cosmetics, anti-counterfeiting inks, printing and dyeing, etc. Among them, natural nacre (micron flakes of anhydrous guanine β-shaped crystals) is the earliest applied natural pearlescent pigment. It is extracted from fish scales and the like through complicated processes. It is expensive and is gradually replaced by other synthetic pearlescent pigments. However, natural nacre is still used in some advanced cosmetics due to its excellent pearl luster, non-toxicity, low density, and natural characteristics (Xu Yangqun, Manufacturing, Processing and Application of Pearlescent Pigments, Beijing: Chemical Industry Press, 2005....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D473/18
CPCC07B2200/13C07D473/18
Inventor 马玉荣陈风华齐利民
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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